XML 39 R1.htm IDEA: XBRL DOCUMENT v3.24.4
Cover Page
 12 Months Ended
Sep. 30, 2024
shares
Entity Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Sep. 30, 2024
Current Fiscal Year End Date --09-30
Entity File Number 000-29716
Entity Registrant Name CGI INC.
Entity Incorporation, State or Country Code Z4
Entity Address, Address Line One 1350 René-Lévesque Boulevard West
Entity Address, Address Line Two 25th Floor
Entity Address, City or Town Montréal
Entity Address, State or Province QC
Entity Address, Country CA
Entity Address, Postal Zip Code H3G 1T4
City Area Code 514
Local Phone Number 841-3200
Title of 12(b) Security Class A subordinate voting shares
Trading Symbol GIB
Security Exchange Name NYSE
Annual Information Form true
Audited Annual Financial Statements true
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Entity Central Index Key 0001061574
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Amendment Flag false
Business Contact  
Entity Information [Line Items]  
Entity Address, Address Line One 11325 Random Hills
Entity Address, City or Town Fairfax
Entity Address, State or Province VA
Entity Address, Postal Zip Code 22030
City Area Code 703
Local Phone Number 267-8679
Contact Personnel Name CGI Technologies and Solutions Inc.
Class A subordinate voting shares  
Entity Information [Line Items]  
Entity Common Stock, Shares Outstanding 203,774,163
Class B shares (multiple voting)  
Entity Information [Line Items]  
Entity Common Stock, Shares Outstanding 24,122,758